1001 in binary
1001 in binary is 1111101001. In hexadecimal it is 3E9 and in octal 1751.
1001 in binary
Pick any whole number from 1 to 10,000.
How to work it out
- 1
Divide 1001 by 2 again and again, writing down the remainder each time, until you reach 0.
- 2
Read the remainders from the bottom up: 1111101001.
- 3
Check by adding powers of 2: 512 + 256 + 128 + 64 + 32 + 8 + 1 = 1001.
LaTeX source of the formulas on this page
\[ 1001_{10} = 1111101001_{2} \]Dividing 1001 by 2
| Number | Division | Remainder |
|---|---|---|
| 1001 | 1001 ÷ 2 = 500 | 1 |
| 500 | 500 ÷ 2 = 250 | 0 |
| 250 | 250 ÷ 2 = 125 | 0 |
| 125 | 125 ÷ 2 = 62 | 1 |
| 62 | 62 ÷ 2 = 31 | 0 |
| 31 | 31 ÷ 2 = 15 | 1 |
| 15 | 15 ÷ 2 = 7 | 1 |
| 7 | 7 ÷ 2 = 3 | 1 |
| 3 | 3 ÷ 2 = 1 | 1 |
| 1 | 1 ÷ 2 = 0 | 1 |
Questions
What is 1001 in binary?
1111101001.
What is 1001 in hexadecimal?
3E9.
What is 1001 in octal?
1751.
How many bits does 1001 need?
10 bits.